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Finding the Fourth Proportional to 705.03, 972.96 and 390.30

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Solution

The fourth proportional to 705.03, 972.96 and 390.30 is: 538.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.03 : 972.96 = 390.30 : x
  2. Step 2: Convert to fraction form
    705.03/972.96 = 390.30/x
  3. Step 3: Cross multiply
    705.03x = 972.96 × 390.30
  4. Step 4: Simplify right side
    705.03x = 379,746.29
  5. Step 5: Solve for x
    x = 379,746.29/705.03
  6. Step 6: Final answer
    x = 538.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.